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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a684471b73e1a5af44ceb021c7dbeece1d7da87cab61268a18a18814ec64df' 
  AND token = 'OeEH5oYDtQVO9THNKQmYXTMvX/UXJNAaDbF4g1x4Hzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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