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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b97619911ccfdd7c132f85cb404e2220c69b8e7ee29866f4b1d945b3e12f370' 
  AND token = 'NvU1lTIEclGw/I5o5ob28w/AfftXB20uY4NVtrkv/SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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