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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aedc838374f7f9ac186572bf13a2e772743a83151d599b67bc8d5772cba41b5e' 
  AND token = 'w7zIX+FATaUVHp3MfdMkfLQyvStqtFoUDcLV2WKk+Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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