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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abcc846d366bfdb9cb63265603ab1c5150d128e7e575c33151a52cba33529ed4' 
  AND token = 'WHjWNdSU5Hdb59e9sAmFzYvWXRieFx/q9TPdrid+Jnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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