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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79063f9740500919dc2cbe47c70445f7fb18e5e597cab7b805a1e470f9d3e50d' 
  AND token = 'DqNcZ1Cn6pFB+torJhf3F1AMRiMAl7MwukiKbhRTXCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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