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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10ccca0f3073780490c4fca3752323968102c85de4de11397aa7ddc11590db3' 
  AND token = 'lO/m9FXNIvcqbURamBtVmW0xm6Sb2uA3jzymgWPIE8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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