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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4940694a7c739bc441423e584128acdbfa9a1be700c71410bf7bf16fdb0a5cc1' 
  AND token = 'vAqwWrSEQrUd+GazRR/Fkdx6D1R9yc+bYFVGO+q9P6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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