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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c31cfd5d2cd2a3aa2d6edec39b4aa0fbd4531f3cbc61e21bdcd2df19b36af4f' 
  AND token = 'nQAqLj025WM/xFxpcQ8RZJDUEBFqja+Ali+su0DC+Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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