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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7289fe1ecb310285e99eb0050fa2a0d35ca6857cd7ae94ade2db2700b904ee28' 
  AND token = '+7mO8G9B+4Y5CZ1AnSTdiPsgZiw8+Cbvo4LWNrZ1sfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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