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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c9ce593598aa5ecdcf12b561f7868b975caf097ac20fe8bc30c58400589ed0f' 
  AND token = '+7nDXKqBra8R67W6mXUF1/ibUZ4+PAvcMN3NEZnQXY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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