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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dada2614de8b11667018cff8069bbd235d769854525e91784c093ff58d619f66' 
  AND token = 'sFnV4EPTHG4jG576dG0PX0iYGBA39dHZI4zMroJMnfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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