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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d59ac8aef49764becaacd2708a13ba182103e4aab1485518e1d5672445688e6' 
  AND token = 'bpxJ2nzL8y9KZ0q0hi2P3O/7NcCcVn2nVE2o38Uye1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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