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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c294236641019f002f0528f86846623543d51db7ba539556a5c7776517e1896b' 
  AND token = '0mc+Wr8m8t2F+6IpdJITKpbSIYxKJZ4c+xOMvKab+Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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