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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792d01c1db42c6b23ca5994818a42d7151d99f1007e1b5362346dbd373ce109b' 
  AND token = 'u7AoFe/fP38Wfphqy8cTVWsjsTThM7j/M8UTNzUv+sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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