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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b71cd0b1367d0b0fddb7e35d3d2eb92aab54d1fdbda98509d335e38ec0d92d' 
  AND token = 'Lttdf0AxL5StTY4r6dsVqt789Cvld+GwbgLbWeS/vsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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