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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a5c88916d36c63eeb270074aba76d279f3f1f1175f942f4b72e98fdb0788a84' 
  AND token = 'n8FYC2z4kSdyWhcnRtIRrSD6BNqNqOilYdMOynrEcsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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