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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd93558bcd718c507cc00f2ceaee001b75b3fac84a26e11b5e3a5edba0e1439c' 
  AND token = 'cpr9fRYFtjPlMpAotWfRo14VP5ujQOIHIeUD8y7Rj7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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