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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '061545066759031473f7713a1720b66556be97b72b411c798d6ae89ce44214d5' 
  AND token = 'OH91nvi2d23NzczS2zcWNQQHXyqW+h6STjDJ11BWL1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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