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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee4b0778a6e6746b7a2afb93a0ef34cea5276cc7d9dc07e0c99f0cba1c2bfea' 
  AND token = 'YOrvJMrfaH7F6rEfi6O0zqtQ0WaqSwXj1n7IyZpdD4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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