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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a3d3a665db26a5b4cb795541486b3da702f49c13641249d748d666bc580bf1' 
  AND token = 'TH3Xx/+w0lqpA+prCMGtNfFwklYUHn6d0YDpQh53fU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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