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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54e05389f92e3943cddd05d9f1a0e4d3ef0f30a41d521d425798bd27c7684f6' 
  AND token = 'atDTY1GcjrraIwI4BdtNurWcqsDVma4KIStSFjbLYGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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