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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed0bc36e1781c8e6c12135d05c5fe9db3dc7aa73495b17bdef7e82096e7dbcb9' 
  AND token = 'nMk+3OUeTkCjlnCNy4OUOwBnCTPKAPtbsoOrIe97um4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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