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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dfa9a36533f4428cd158a9959c8506bf5e5ec5bd3a645fcd349737f4a5afa5d' 
  AND token = 'poiuXbYaYYaRusH71WCXmubAL6Mqig3LPHcOoQgRyxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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