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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840e536e532ed8d819c6c5e1613d20204d4becbf151c5c005121843136c18753' 
  AND token = 'WK0VYN2qjoxNNJYMZeWQ7h/CCyX7QIuAfAqbPPhFKYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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