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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fdbfe420cabac32f0b8791b0b9ca51511a3a090d9b0f5179f7f93d47911952d' 
  AND token = 'vWcWmHFmxr5PSj1I3rvWWYJN76N/qo3+hauvWF5sspw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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