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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1865d0ce946cb4567be8623186aa5cad3db5873e4fc12b35360aff96a8f173' 
  AND token = 'Yxmch+UPmXYf7J1MLf4U0ubI98BrqwE3oa+A5uWxl9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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