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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21cb2f397104b227f81a0ec3471c2430dda213eb9ac966291b840c45a1600b7a' 
  AND token = 'X+u1QfBU4kLMOceCsnkkgAmAYzM58USDJy/UQv0QxVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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