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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9612bfa32f049d20d1d8dc9ad3ec12237726c2b4f01605162b3ffb869d5012c9' 
  AND token = 'smh6UZjba1Y3Rj0EFSBT3anqmDwlxZgeCyzbqRRCexI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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