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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '245ce5a6fac034ac8ce7339b966eb00aeb3a190290840b8ab2d37cc0fec62d9d' 
  AND token = 'K384ybuyzNh9lsrYGEA/TmFp6csFK01K8IfGoNfRM5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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