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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd5164af83f534c1e1a16ac0de0ecaea3ba2edfa1e5c428960630da2796d129' 
  AND token = 'O4yjufxJ5AIJx7vEIMNmlbxBrSccHGXI5BbLGuMkJXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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