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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1491147afc3c0c7005e3721d0104ceaa06de921f4aab328342e8caace9abc17' 
  AND token = 'f9qTuq7OJW+0pa1P8nVjvq+LNtabczuhcaR5PULwIl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}