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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd16d6e31437c1ccb6e6576059942c80a55bb985709218414eed7440f3d771d63' 
  AND token = 'V8c3TRc1zDVPULhM0FTJ6n7Jn0s/+KOnPWHleYnf3u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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