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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b7ce676f157ad028d7f80db086202a1cdf3444d1385dcca733e1c699f13d94' 
  AND token = 'n9XKeVQMmISzDG7nu9v/qPRMS0X0q0VacFRkecf/ONQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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