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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2308a1e5a27789f6b067f0db60fdb8fd0d0d6f2fb5bd336bef911d8cbb1d5aa1' 
  AND token = 'gQ2skVpBoLFKUL3wm9/Tm2xMU1Yq+rI8ogQttUFIHjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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