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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc0081334fc7663d7ca52af9119faa1ba226e1a808ca6999966436948a8e26b5' 
  AND token = '+7u46/oECHX9/6wJZ8WqxR1VOVWWFdR5w5USKpzey9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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