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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4309df73afd169f1fcceb0164e05a3512f4ff7e0b2141231e14d1f5a7c9888a' 
  AND token = 'TK9MLqquuvcHvEVS/d3wC+Hjbx+SLKnD6QT7bUHFN/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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