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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f3a01177ddd56efa5c5dbf4a3464d8eef393e063b4cd6787db1788ba3cab2f5' 
  AND token = 'vBDVEYdANXit+AV6UeH8OrIFGfv0IZJUKmn/Xd0+ALo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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