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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f4ef3b11cee24e1cae73c3929f50bd5bfb58249796344677d379db9902013d' 
  AND token = 'hglYjF27BrIpU9NjQ6SXuSpurBPfUlON5AxbrZ/DhMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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