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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6515029d68dbd48a03b6a2defa6c0d23df51433fd633c20c62931cd14436fc70' 
  AND token = 'iLv6p2nNO98Q1GFwUthIlyJm4cbASAHR+M0wQ4CZrCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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