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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5462cff4e4e0167c6d6c5ffd349c721a59f0f52677ea7e4de309f3c74eaca5c8' 
  AND token = 'AJTZFY7WqLiva8PRDRlYQR8jRYVkRjQjW3aa7+45O8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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