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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa31dadaf3ea7308459f33beffa4769827e1befe1381c4b01e8328bc43bb1a7' 
  AND token = '48OhFrZ3VYlyDvzD6bcVpxb1/ijs8zS2kT/vvr73jX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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