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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694fc5180e64b5aa91f02343d8d5cbc11baadeab24b7b9ef5fad1929f4008786' 
  AND token = 'XIhucEfvyqBj7+n8Av6DK1E/+wGD0b12QfdbXNyH5+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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