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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d73394542224d3b7a6fc2cc40b64fb88225213c92880c9bbfe729b3738943c' 
  AND token = 'AmxHLnbUxQbf85QLbFSd7LD6wjx0LcR5p25Tf83cfQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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