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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '325b53934a70b0884a0e4958ae64f40bfc2c9abb9c765b12194c21b1139328e0' 
  AND token = 'utG4wb2YQqOVb3VMC7Ayrxc9QVFob7vLiwjMG/b2fxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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