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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4311f0b8ad1899d660ddbc0812735ab1d2d3412da5700230d14bec8dae36037' 
  AND token = 'AGQCELeXz/21sv/NZT2J8THt+GB+v0rEn1khlXhB3G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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