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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9802c37e218db1d4cc5d725bc41dc3044fc681db99daed132cffd5b82f43124f' 
  AND token = 'rfu0B0Nbroji7dYmBIJsPuL/oTZo6pCf3EewuRatow0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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