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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62defe74d05b98c3d75ba3f5d07da596f24d44ad108be048bf67311bafb24c6' 
  AND token = 'dvtM+ycWkNpRsV2d9SGJxJTO1XZt+aLp/uCPvthUb/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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