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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d79da03aa31d79afc6bafd5367a0f61c2bc796180058eecc33ba8ab0f66d72' 
  AND token = '/VJJw8dNu5OWHN/4tnIedsL7/nmypipyQqbZhvrIWKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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