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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e24e742afce84ad5c1ea39165752be78aea3b38a22172969695187d455e7d469' 
  AND token = '8SnVUJ190b0BPRHOAZbWURW04zB9yeqeHFcyoKx1fGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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