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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed0dcaf11f0ab40e6ea9f58e23c7198d012060253ef06ca03cecb53f5d1d903' 
  AND token = 'fFnSR9SiM/6cskIlN/a6BbGdA6HZRVjrvEhD9nK815w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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