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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f74ab4375e2ff95394045ff69b8edab1d3355cf496ad2ca96a03b8efd640b34d' 
  AND token = 'xCkoITkBifo2dbD1tDh1VTeLeMOEFuL+eIzz7I3us8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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