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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe91573d0edef41033e8e872f9dd13ccf7e0c7c1b10924306b4d297504596b8' 
  AND token = 'wgatxYvBC6enP50vGdtYyQ2vEoOtMuiM/WHMYoJlo7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00154

JSON explain

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