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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da295c377c11d045e7be1196e976fb87bc11e771eff51de061349da7f633782' 
  AND token = 'SNXrx4nir/wnK60RMVm7OjBlAF8ZNRA7y76Rw6ZShC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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