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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4159c5f4c0b02df4ac7f4d4febdbcc04f50f60aa5c1d34f9d6c048fd0451c3e' 
  AND token = 'bdcx22OwO8qIjFWqsTInYl8VXXvLh6nvngYZS7NYKhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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