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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08888fe1bc20cef118e92134da5f93955ec9cc6039a777de6f45a92eb2d63e66' 
  AND token = 'nrJEWdq63hQo9CGlmSQ5H60Wf8K6zhyjruFz8u1BP2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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