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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ec81b256ec9645d8211ad5a7bee8a60260b088e6c591b7739af14a30d6b980' 
  AND token = '8Ge4YUkVt/CojPGKoS6KR1D8BWTn8aQQ6paFLKWtoa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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